SimpleStatusBar.java

/**
 * ====================================================================
 * Simple StatusBar
 * ====================================================================
 *
 * Description :
 *     A Swing graphical application displaying a simple window with:
 *       - a custom status bar;
 *       - a button to display the time of a user action;
 *       - a button to close the application.
 *
 *     The status bar is composed of two areas:
 *       - a left area containing status messages;
 *       - a right area containing additional information,
 *         separated by graphic separators.
 *
 * ====================================================================
 */

//import java.awt.event.WindowListener;
//import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Toolkit;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;

import java.awt.Image;

import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JComponent;
import javax.swing.SwingUtilities;

//import java.util.Calendar;
//import java.util.Date;
//import java.text.SimpleDateFormat;

import java.io.IOException;
import javax.imageio.ImageIO;
import java.net.URL;

import java.time.LocalDate;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;

public class SimpleStatusBar 
{
	
	/*****************************
	 * CUSTOM PRIVATE PROPERTIES *
	 ****************************/
	private static final int FRAME_SIZE_X = 600;
	private static final int FRAME_SIZE_Y = 500;
	
	private static final int btnShow_LOCATION_X = 420;
	private static final int btnShow_LOCATION_Y = 15;
	private static final int btnShow_SIZE_X = 140;
	private static final int btnShow_SIZE_Y = 40;
	
	private static final int btnQuit_LOCATION_X = 420;
	private static final int btnQuit_LOCATION_Y = 70;
	private static final int btnQuit_SIZE_X = 140;
	private static final int btnQuit_SIZE_Y = 40;
	
	/*************************************
	 * JStatusBar - METHODS & PROPERTIES *
	 ************************************/
	private static class JStatusBar extends JPanel {
		private static final long serialVersionUID = 1L;
		private JPanel leftPanel;
		private JPanel rightPanel;
		
		public JStatusBar() {
			createPartControl();
		}
		
		private static class SeparatorPanel extends JPanel {
			private static final long serialVersionUID = 1L;
			private final Color leftColor;
			private final Color rightColor;
			public SeparatorPanel(Color leftColor, Color rightColor) {
				this.leftColor = leftColor;
				this.rightColor = rightColor;
				setOpaque(false);
				setPreferredSize(new Dimension(2, 18));
			}
			@Override
			protected void paintComponent(Graphics g) {
				super.paintComponent(g);
				g.setColor(leftColor);
				g.drawLine(0, 0, 0, getHeight() - 1);
				g.setColor(rightColor);
				g.drawLine(1, 0, 1, getHeight() - 1);
			}
		}
		
		private void createPartControl() {    
			setLayout(new BorderLayout());
			setPreferredSize(new Dimension(10, 23));

			leftPanel = new JPanel(new FlowLayout(FlowLayout.LEADING, 5, 3));
			leftPanel.setOpaque(false);
			add(leftPanel, BorderLayout.WEST);

			rightPanel = new JPanel(new FlowLayout(FlowLayout.TRAILING, 5, 3));
			rightPanel.setOpaque(false);
			add(rightPanel, BorderLayout.EAST);
		}

		public void setLeftComponent(JComponent component) {
			leftPanel.add(component);
		}
		
		public void addRightComponent(JComponent component) {
			JPanel panel = new JPanel(new FlowLayout(FlowLayout.LEADING, 5, 0));
			panel.add(new SeparatorPanel(Color.GRAY, Color.WHITE));
			panel.add(component);
			rightPanel.add(panel);
		}
		
		@Override
		protected void paintComponent(Graphics g) {
			super.paintComponent(g);

			int y = 0;
			g.setColor(new Color(156, 154, 140));
			g.drawLine(0, y, getWidth(), y);
			y++;

			g.setColor(new Color(196, 194, 183));
			g.drawLine(0, y, getWidth(), y);
			y++;

			g.setColor(new Color(218, 215, 201));
			g.drawLine(0, y, getWidth(), y);
			y++;

			g.setColor(new Color(233, 231, 217));
			g.drawLine(0, y, getWidth(), y);

			y = getHeight() - 3;

			g.setColor(new Color(233, 232, 218));
			g.drawLine(0, y, getWidth(), y);
			y++;

			g.setColor(new Color(233, 231, 216));
			g.drawLine(0, y, getWidth(), y);
			y++;

			g.setColor(new Color(221, 221, 220));
			g.drawLine(0, y, getWidth(), y);
		}
	}

	/***********************
	 * GUI CREATOR SECTION *
	 **********************/
	private static void createGui()
	{
		final DateTimeFormatter DATE_FORMAT = DateTimeFormatter.ofPattern("dd/MM/yyyy");
		final DateTimeFormatter TIME_FORMAT = DateTimeFormatter.ofPattern("HH:mm:ss");
		
		// variables
		Image icon = null;
		JButton btnShow;
		JButton btnQuit;
		JFrame frame;
		
		frame = new JFrame();
		frame.setTitle("Simple Status Bar");
		
		//places the window in the center of the user's screen
		Toolkit tk = Toolkit.getDefaultToolkit();
		Dimension screenSize = tk.getScreenSize();
		int screenHeight = screenSize.height;
		int screenWidth = screenSize.width;
		frame.setSize(FRAME_SIZE_X, FRAME_SIZE_Y);    
		frame.setLocation((screenWidth - FRAME_SIZE_X) / 2, (screenHeight - FRAME_SIZE_Y) / 2);
		//idem
		//frame.pack();
		//frame.setLocationRelativeTo(null);
		
		try {
			//URL iconURL = SimpleStatusBar.class.getResource("SimpleStatusBar.png");
			URL iconURL = SimpleStatusBar.class.getResource("/SimpleStatusBar.png");
			if (iconURL != null) {
				//Image icon = ImageIO.read(iconURL);
				icon = ImageIO.read(iconURL);
			} else {
				System.err.println("Resource '/SimpleStatusBar.png' not found.");
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		if (icon != null)
			frame.setIconImage(icon);
		
		
		//frame.setLayout(null);
		frame.setLayout(new BorderLayout());
		frame.setResizable(false);
		//frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
		//frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setExtendedState(JFrame.NORMAL);
		
		// Create the NORTH JPanel with 2 buttons
		JPanel northPanel = new JPanel(null);
		northPanel.setPreferredSize(new Dimension(600, 120));
		
		final JStatusBar statusBar = new JStatusBar();
		JLabel leftLabel = new JLabel("Your application is running.");
		statusBar.setLeftComponent(leftLabel);
		
		final JLabel timeLabel = new JLabel();
		timeLabel.setHorizontalAlignment(JLabel.CENTER);
		statusBar.addRightComponent(timeLabel);
		timeLabel.setText("           ");
		
		final JLabel dateLabel = new JLabel();
		dateLabel.setHorizontalAlignment(JLabel.CENTER);
		statusBar.addRightComponent(dateLabel);
		//dateLabel.setText(LocalDate.now().toString());
		dateLabel.setText(LocalDate.now().format(DATE_FORMAT));
		
		// Create the "show" button
		btnShow = new JButton("Show");
		btnShow.setToolTipText("Display the current system time");
		btnShow.setBounds(btnShow_LOCATION_X, btnShow_LOCATION_Y, btnShow_SIZE_X, btnShow_SIZE_Y);
		btnShow.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				leftLabel.setText("Button pressed at " + LocalTime.now().format(TIME_FORMAT) + ".");
				
				//Calendar currentCalendar = Calendar.getInstance();
				//Date currentTime = currentCalendar.getTime();
				//Date currentTime = new Date();
				//SimpleDateFormat timeFormat = new SimpleDateFormat("HH:mm:ss");
				//leftLabel.setText("Button pressed at " + timeFormat.format(currentTime) + ".");
				////timeLabel.setText(timeFormat.format(currentTime));
			}
		});
		northPanel.add(btnShow);
		
		// Create the "exit" button
		btnQuit = new JButton("Exit");
		btnQuit.setToolTipText("Close the application");
		btnQuit.setBounds(btnQuit_LOCATION_X, btnQuit_LOCATION_Y, btnQuit_SIZE_X, btnQuit_SIZE_Y);
		btnQuit.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				frame.dispatchEvent(new WindowEvent(frame, WindowEvent.WINDOW_CLOSING));
				//frame.dispose();
				//System.exit(0);
			}
		});
		northPanel.add(btnQuit);
		
		//WindowListener listener = new WindowAdapter() {
		//	@Override
		//	public void windowClosing(WindowEvent e) {
		//		//System.out.println("Closing window event");
		//		frame.dispose();
		//		System.exit(0);
		//	}
		//};
		//frame.addWindowListener(listener);
		
		frame.add(northPanel, BorderLayout.NORTH);
		frame.add(statusBar, BorderLayout.SOUTH);
		
		frame.setVisible(true);
	}

	public static void main(String[] args)
	{
		//SwingUtilities.invokeLater(() -> createGui());
		SwingUtilities.invokeLater(SimpleStatusBar::createGui);
	}
}